% data for Chapter 6 Supplementary Exercises

ex = input('Exercise number (11-13)? ');

if ex==11 
   A = [3 -2 8;0 5 -2;0 -4 3] 
elseif ex==12
   A = [1 5 -6 -7;2 4 5 2;0 0 -7 -4;0 0 3 1]    
elseif ex==13
   A = [.4 -.3;.4 1.2] 
else
   disp('No data for this supplementary exercise, Chapter 6.')
end
